The school mobility is a highly recurrent phenomenon in Chile. Every year the percentage of students who move from one school to another reaches 11.5% in Primary Education. Considering the high recurrence, the question is: What are the implications of school mobility on the quality and equity of the Chilean education? To answer this question, this research issues a diagnosis of the learning achieved by students in 4th grade of Primary Education who have moved from one school to another, comparing them with the learning achievements from those who remained in the same school. It also evaluates the quality of the educational establishments that receives the transferred students. It works with census data from 182 885 students.